Shaving device



is retained by means of bayonet slots l2. and cooperating pins I3 on the upper end i4 of the handle Il). Mounted in the outer end of the tubular shell ll is a skin contacting shear plate I5 formed voi thin metal having a' plurality of small apertures I6 therein which are onthe order of about .025 of an inch in diameter. The plate I5, is formed in theshape of a portion of the surface of the'sphere having a radius of curvature on the order of two inches. The shell l l and shear plate l5 are retained on the end i4 of the handle by means of a friction lock l1 (shown in Figure 3) which consists of a strip i8 of springmetal attached as by vmeans of a rivet lt'tova side of the upper end of the handle i4 and has an outwardly curved end portion 23 which engages the innersurface of the shell Il., The frictionlcck l1 is provided with a downwardly directed finger piece 2| which permits inward movement of the end of the lock l1, thus releasing the collar Il for rotation.

Cooperating with the skin contacting shear plate l5 is a rotary cutter head which includes a collar 22 mounted on the end of the motor vshaft 23 as by means of a set screw 24. The cutter head includes an enlarged disk portion'25 adjacent its center and a substantially frusto-conical member 23 having a curved upper surface 21 which is concentric with AnA annular groove 28 is provided in the rusto-conical member 26 for receiving severed hairs and for receiving a spring or split ring 29 which retains the shearing blades 33 in diametrically extending slots 3| .in the cutter head. The

slots 3| may be easily formed in the cutter head by milling -or sawing, and as many of the slots as desired may be formed in the head, although in the preferred form of device, two intersecting diametrical slots are provided. An undercut groove 32 is formed adjacent the bottom of the the domed shear plate 4 rection, will catch slot 28 and receivesand retains the spring or split ring 29 adjacentthe bottom of theslot 28. vThe shearing blades 33 are loosely mounted on the spring ringA 29 as shown in Figure 1. The shearing blades 33 consist generally of trapezoidal shaped strips of metal having two right angularly related edges 34 and 35, an inclined edge 36 and an arcuate edge 3l of substantially the same radius of curvature as the under surface of the shear plate l5. The shear blades 33 are also provided adjacent their center portion apertures 33 with a considerably greater diameter than the cross-sectional diameter of the spring ring 2 9, wherebyl the blades can ally through a limited distance inthe slots 3l. The inclined edges 36 of the blades are adapted to cooperate withan inclined or conical lsurface 39 on an annular ring or sleeve 43 which is received on the disk-portion 25 of the cutter head and is fixed thereto inabutting relationship by swaging over a portion of lthe edge of the disk 25 as shown in Figure 1, thereby forming a substantially unitary assembly. When the cutter head 22 is rotated by the motor, the centrifugal force exerted on the cutters 33 urges them outwardly and their inclined edges 33 slide on the inclined surface 39 on the collar 40 causing the blades to be urged upwardly or toward the shear plate l5, thereby assuring close engagement between the shear plate and the shearing edges of the blade 33.

Inward movement ofthe blades 33 is lirnitedv by means of a -cup-'shaped bushing 4l which is fixed in a recess 42 in the cutter head and provides vertically extending shoulders against move upwardly and axian arc concentric with of the cutter head 22.

cessare which the inner edges 34 of the blades may bear. In the inner recess 33 of the bushing 4I, is mounted a button or disk 4 having a reduced shank 45 which ts closely within the recess 43 and which has an inner end 45 engaging a small ball bearing 41 to reduce the frictional engagement between the button 44 and the bushing 4l during rotation of the cutter. The button 43 is spaced about .001 of an inch from the inner surface of the shear plate I5, and is adapted to engage the under surface of the shear plate and prevent it from undue exing should the shear plate be pushed too strongly against the skin.

In Figure is shown one of the shear blades 33, greatly enlarged. The blade 33 is provided with a plurality of saw or milled cuts 48 which form upstanding teeth 49 of triangular cross-sec-` tion thereon. The cuts d8 are made at an angle jects through an aperture i6 in the shear plate l5, and a blade strikes it, a shearing action will be produced due to the relative inclination of the shearing edge of the blade 33 and the edge of the aperture i6. In some instances, the hair may be tilted sufiiciently by the impact of the shearing edge to force it partially out of the aperture l5 without severing it. However, the succeeding shearing edge being inclined in an opposite dithe hair and move it against fa diierent portion of the aperture, and will shear at a different ang1e,lthereby tending to straighten the hair out perpendicularly to vthe skin and sever it closely adjacent to the skin.

A similar shearing action can be obtained with of the strip 53 are on the order of 60. The upper or shearing edge 5i of the cutter 50 is formed on the under surface ofthe shearing plate. The blade 50 is provided with an inclined edge 52 which cooperates with the inclined surface 39 of the cutter-supporting head to cause the blade 50 to be' urged outwardly and upwardly by centrifugal force during operation This type of blade operatesv in a manner similar to the blade described above, in that the shearing edges provide a true shearing cut'during operation.

Another form of blade is disclosed in Figure 7 which is similar to the blade disclosed in Figure 5. The modified form of blade consists of a thin strip of steel 33 having an. aperture 38' therein for receiving a retaining ring. 'I'he upper edge of the -strip 33' is slotted to form teeth 43' that are inclined with respect vto the longitudinal and transverse axes of the strip 33. The upper edges of the teeth 43' are ground or lapped to conform to the undersurface of the shear plate, thereby forming wedge-shaped orknife-like shearing edges thereon. The teeth 49 may be triangular in cross-sectionl or rectangular as they are shown.

As shown in Figure 8, the slots 53 in the cutter head 54 may be inclined relatively to the axis of rotation of the cutter head. The blades may be mounted in the slot 53 and ground or lapped to provide the proper alignment of shearing edges- 1n order to prevent severed hair from falling out of the razor and getting on the clothing and into thebearings of the electric motor, a disk-like cutter member rotatable about an axis substantially normal to the shear plate and having at hair retalning'me'mber 55 may be loosely mounted f beneath thedisk-like -portion 25 of the cutter vhead as shown in Figure 1. Themember bb frictionally engages the'shell Il and thereby re-f tains the severed hair in the shell ll. The hair may be removed from the interior of the shell l i by depressing the friction lock il, rotating the shell li to release the pins i3 from the -bayonet slots it and withdrawing the 'shell il and shear plate it, thereby exposing the entire cutter head iti? and shearing edges.

The above described constructions constitute improvements over the types of shaving razors disclosed in our copending application Serial No. 135,108, illed January l5. 1938.

Our new construction, therefore, includes the combination of the domed perforated shear plate,

and a massive rotary cutter havingv supporting means thereon .for preventing excessive hearing of the shear plate, which are present vin the dry shaving` razor disclosed in our copending application Serial No. 135,108, and in addition includes improved blade constructions, a simplified cutter head .and a hair receiving compartment which are not disclosed in our copending application Serial No. 185,108.

it Will be understood from the foregoing that We have produced an improved construction which. has avrapidand effective shearing action and which because oi. the increased size of the -shear plate, allows much more rapid shaving to taire place. It should be understood, ofcourse, that the construction described above is illustrative only, of the present form of the invention,

and that it can be varied considerably in many^ details without departing from the invention.

We claim:

l. in a shaving device,` the combination of a thin, apertured, skin-contacting shear plate, an inner cutter member having at leastone out-a Wardly extending slot therein, a blade movably disposed in said slot, said blade having a plurality of substantially parallel shearing edges inclined at an acute angle to the axis of the blade and contacting the under surface of said shear plate,

A and means for rotating the cutter about an axis substantially normal to the shear plate to wipe the shearing edges over said under surface to sever hairs projecting through the apertured shear. plate.

2. The shaving device set forth in claim 1 in which the slot in the cutter member is inclined to said axis.

3. In a shaving device, the combination of a thin, apertured skin;contactlng shear plate, an

inner cutter member having a plurality of out wardly extending slots therein, a blade movably disposed in 'each slot, said blades having a piurality of shearing edges inclined with respect to the axis of the blade and contacting the under surface of said shear plate, shearing edges on alternate blades Abeing inclined oppositely, and means for rotating the cutter about an axis substantially normal .to the shear plate to Wipe the shearing edges over said under surface to sever the hairs projecting through the apertured shear plate.

t. In a shaving device, the combination of a thin apertured. skin-contacting `shear plate, a

least one radial slot therein, a corrugated blade movably mounted in saidslot and having a zig- V zag shearing edge cooperating with the shear plate tol sever hair, and means for rotating saidt. In a shaving device, the combination of a thin, apertured skin-contacting shear plate, a.

diskulilre inner cutter member having a plurality of slots and an aular groove therein, a plurality oi cutter blades disposed ln said slots, each having an aperture therein, a spring member of lesser cross-sectional diameter than and passing through the apertures in the blades releasably connected to the cutter member and disposed adjacent the bottom oi the groove for retaining the blades in the slots with capacity ior relative movement and means for rotating the cutter member about an axis substantially perpendicular to said shear plate. t

7. A cutter member for a shaving device comprising a disk-like member adapted to be connected to a drive shaft, a circular member super- `:imposed on and having a conical outer surface converging toward said disk-like member, a plurality of slots in said circular member extending inwardly from said conical surface, blades in said y slots having outer edges inclined substantially complementar-ily to said conical surface, and an annular collar having a conical inner face connected tothe Lcincular member with their conical faces in abutment. i i

8. In a shaving device having a thin, apertured skin-contacting shear plate and av slotted cutter member rotatable about an axis substantially perpendicular to the skin contacting plate;

the combination with the cutter member of a relatively movable blade comprising a thin strip of metal having an aperture substantially cenl trally thereof, means onAsaidcutter member engageable in said aperture for limiting movement of said blade, an inclined end on said strip and a plurality of shearing edges on a longitudinal edge of said strip, saidshearing edges being iniclined to the axis of said strip.

9. A blade for a shaving device, comprising a corrugated strip of metal `having an aperture therein, a longitudinally extending zigzag shearing edge, and any end portion inclined at an acute angle to the shearing edge. y

10. A blade for a shaving device, comprising a strip of lmetal having a plurality of teeth providing shearing edges spaced apart along a longitudinal edge thereof, said teeth being inclined to the longitudinal axis of the strip and an end portion inclined at 'an acute angle to the said lungitudinal edge.

11. In `a shaving device, the subcombinatlon of a rotatable cutter member, a plurality of blades mounted on and extending outwardly from adiacent the center of the cutter member, and a plurality oi shearing edges on each blade inclined-at an acute angle to the axis of' said blade, the

shearing edges on one blade boing inclined at a.

dilerent angle to the axis of the blade than the 12. in a shaving device the combination of a thin, exible, apertured .and transversely curved skin contacting shear plate, an inner cutter member, at least one shearing element movably mounted on said cutter member and having an aperture therein, means onA said cutter member disposed in said aperture for limiting movement o saidshearing element and detachably connect ing said shearing element to said cutter member, 

